new: [doc] basic README added

README.md

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+# Windows Event ID Database
+
+Windows Event ID Database is a JSON file containing the known Windows Event ID.
+
+Being frustrated with the inability to find a single file with all known Windows Event ID, I gathered Windows Event ID in this repository
+into a [single JSON file](./database/windowseventid.json).
+
+# License
+
+The work is CC0 1.0 Universal (Public Domain). Feel free to reuse it.
+
+# Source
+
+- Microsoft - [Appendix L: Events to Monitor](https://docs.microsoft.com/en-us/windows-server/identity/ad-ds/plan/appendix-l--events-to-monitor)
+
+# Contribute
+
+- Don't hesitate to make a pull-request with new Event ID. The community will thank you!
+